refactor: use private named constructor params

lib/providers/offline_watch_provider.dart

@@ -23,9 +23,7 @@ class OfflineWatchProvider extends ChangeNotifier with DisposableChangeNotifierM
   final OfflineWatchSyncService _syncService;
   final DownloadProvider _downloadProvider;
 
-  OfflineWatchProvider({required OfflineWatchSyncService syncService, required DownloadProvider downloadProvider})
-    : _syncService = syncService,
-      _downloadProvider = downloadProvider {
+  OfflineWatchProvider({required this._syncService, required this._downloadProvider}) {
     // Listen to sync service changes to update UI
     _syncService.addListener(_onSyncServiceChanged);
   }